Plastic Milk
Turn milk into a solid!
Materials Needed
•skim milk
•white vinegar
•microwave proof bowl
•strainer
Instructions
1.I bet you've heard the nursery rhyme "Little Miss Muffet." Remember how she sat on
her tuffet eating her curds and whey? But, do you know what curds and whey are?
2.Here's a fun way to find out:
3.Check with a grown-up before you begin.
4.Add 4 teaspoons of white vinegar to 1 1/2 cups of skim milk.
5.Microwave the mixture for about a minute. If you're not allowed to use the
microwave, be sure to ask an adult to help you.
6.After a minute, the milk and vinegar will be separated into two parts, a liquid and a
solid.
7.Here's what happened to the milk. By adding the vinegar, you have created a
chemical reaction that separated the milk into two parts, a solid-the curds-and a
liquid-the whey.
8.Now, when you stir the milk, the curds become a "blob."
9.When you strain the liquid off, you can make the blob into one big lump.
10.Let it cool off, and then you can play with it. It feels like rubber. The protein in the
curds is what makes it act like rubber.
11.You can form the blob into shapes. If you leave it out, it will harden.
Credits: Pbskids.org
Materials Needed
•skim milk
•white vinegar
•microwave proof bowl
•strainer
Instructions
1.I bet you've heard the nursery rhyme "Little Miss Muffet." Remember how she sat on
her tuffet eating her curds and whey? But, do you know what curds and whey are?
2.Here's a fun way to find out:
3.Check with a grown-up before you begin.
4.Add 4 teaspoons of white vinegar to 1 1/2 cups of skim milk.
5.Microwave the mixture for about a minute. If you're not allowed to use the
microwave, be sure to ask an adult to help you.
6.After a minute, the milk and vinegar will be separated into two parts, a liquid and a
solid.
7.Here's what happened to the milk. By adding the vinegar, you have created a
chemical reaction that separated the milk into two parts, a solid-the curds-and a
liquid-the whey.
8.Now, when you stir the milk, the curds become a "blob."
9.When you strain the liquid off, you can make the blob into one big lump.
10.Let it cool off, and then you can play with it. It feels like rubber. The protein in the
curds is what makes it act like rubber.
11.You can form the blob into shapes. If you leave it out, it will harden.
Credits: Pbskids.org
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